• fix compile error on threaded perls (RT#93934 - thanks Andreas
  Koenig for reporting)
  
• fix exporter configuration (RT#93929 - thanks Andreas Koenig for
  reporting)
  
• fix RT#40905 by allowing choose an appropriate implementation
  
• add test for RT#76749 - seems not reproducable (but hopefully
  reporter David J. Oswald can fix the test to help fixing the
  issue beyond)